Rodenstock APO-Sironar N 100mm f/5.6

Rodenstock Apo-Sironar-N 100mm f/5.6 is the wide-of-normal apochromatic LF plasmat — equivalent to roughly 30mm on 35mm when used on 4×5. Direct competitor to Schneider Apo-Symmar 100 / Fujinon CM-W 105.

Key features

• Mount: Copal 0 shutter (1s to 1/500, X-sync at all speeds)
• Focal length: 100mm
• Maximum aperture: f/5.6
• Image circle: ~165mm at f/22 — covers 4×5 with limited movements
• Optical formula: Apochromatic plasmat
• Multi-coating standard

Use case + rendering

The 100 Apo-Sironar-N is the wide-of-normal Rodenstock 4×5 plasmat — for tighter-interior architectural and landscape work. Apochromatic correction reduces color fringing on high-contrast subjects.

Compatible cameras

• Toyo 45A / Toyo 45AII / Toyo 45G
• Cambo SC / Cambo Calumet 45NX
• Graflex Crown Graphic / Graflex Speed Graphic / Graflex Super Graphic

Related lenses

• Rodenstock Apo-Sironar-N 135mm f/5.6 — slightly longer
• Schneider Apo-Symmar 100mm f/5.6 — Schneider equivalent
• Fujinon CM-W 105mm f/5.6 — Fujinon equivalent